OpenCascade/occt
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occt/src/OpenGl/OpenGl_FrameBuffer.cxx
kgv 62e1beed96 0026392: Visualization, TKD3DHost - provide straight-forward base for integration of TKOpenGl viewer into D3D-based application 
D3DHost_GraphicDriver - new graphic driver providing D3D host for OpenGL workspace.
WNT_Window - handle virtual dimensions within virtual window.
OpenGl_FrameBuffer::Init() - add protection against 0 dimensions.
V3d_View::IsInvalidated() - add method to check view cache validation state.

ViewerTest::ViewerInit() - create virtual window without decorations on Windows.
2015-07-28 17:59:10 +03:00

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// Created by: Kirill GAVRILOV
// Copyright (c) 2011-2014 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.
#include <OpenGl_FrameBuffer.hxx>
#include <OpenGl_ArbFBO.hxx>
#include <Standard_Assert.hxx>
#include <TCollection_ExtendedString.hxx>
// =======================================================================
// function : OpenGl_FrameBuffer
// purpose :
// =======================================================================
OpenGl_FrameBuffer::OpenGl_FrameBuffer (GLint theTextureFormat)
: myVPSizeX (0),
myVPSizeY (0),
myTextFormat (theTextureFormat),
myGlFBufferId (NO_FRAMEBUFFER),
myGlColorRBufferId (NO_RENDERBUFFER),
myGlDepthRBufferId (NO_RENDERBUFFER),
myIsOwnBuffer (false),
myColorTexture (new OpenGl_Texture()),
myDepthStencilTexture (new OpenGl_Texture())
{
//
}
// =======================================================================
// function : ~OpenGl_FrameBuffer
// purpose :
// =======================================================================
OpenGl_FrameBuffer::~OpenGl_FrameBuffer()
{
Release (NULL);
}
// =======================================================================
// function : Init
// purpose :
// =======================================================================
Standard_Boolean OpenGl_FrameBuffer::Init (const Handle(OpenGl_Context)& theGlContext,
const GLsizei theSizeX,
const GLsizei theSizeY)
{
if (theGlContext->arbFBO == NULL)
{
return Standard_False;
}
// clean up previous state
Release (theGlContext.operator->());
// setup viewport sizes as is
myVPSizeX = theSizeX;
myVPSizeY = theSizeY;
const Standard_Integer aSizeX = theSizeX > 0 ? theSizeX : 2;
const Standard_Integer aSizeY = theSizeY > 0 ? theSizeY : 2;
// Create the textures (will be used as color buffer and depth-stencil buffer)
if (!myColorTexture->Init (theGlContext, myTextFormat,
GL_RGBA, GL_UNSIGNED_BYTE,
aSizeX, aSizeY, Graphic3d_TOT_2D))
{
Release (theGlContext.operator->());
return Standard_False;
}
// extensions (GL_OES_packed_depth_stencil, GL_OES_depth_texture) + GL version might be used to determine supported formats
// instead of just trying to create such texture
if (!myDepthStencilTexture->Init (theGlContext, GL_DEPTH24_STENCIL8,
GL_DEPTH_STENCIL, GL_UNSIGNED_INT_24_8,
aSizeX, aSizeY, Graphic3d_TOT_2D))
{
TCollection_ExtendedString aMsg = TCollection_ExtendedString()
+ "Warning! Depth textures are not supported by hardware!";
theGlContext->PushMessage (GL_DEBUG_SOURCE_APPLICATION_ARB,
GL_DEBUG_TYPE_PORTABILITY_ARB,
0,
GL_DEBUG_SEVERITY_HIGH_ARB,
aMsg);
theGlContext->arbFBO->glGenRenderbuffers (1, &myGlDepthRBufferId);
theGlContext->arbFBO->glBindRenderbuffer (GL_RENDERBUFFER, myGlDepthRBufferId);
theGlContext->arbFBO->glRenderbufferStorage (GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, aSizeX, aSizeY);
theGlContext->arbFBO->glBindRenderbuffer (GL_RENDERBUFFER, NO_RENDERBUFFER);
}
// Build FBO and setup it as texture
theGlContext->arbFBO->glGenFramebuffers (1, &myGlFBufferId);
theGlContext->arbFBO->glBindFramebuffer (GL_FRAMEBUFFER, myGlFBufferId);
theGlContext->arbFBO->glFramebufferTexture2D (GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
GL_TEXTURE_2D, myColorTexture->TextureId(), 0);
if (myDepthStencilTexture->IsValid())
{
#ifdef GL_DEPTH_STENCIL_ATTACHMENT
theGlContext->arbFBO->glFramebufferTexture2D (GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
GL_TEXTURE_2D, myDepthStencilTexture->TextureId(), 0);
#else
theGlContext->arbFBO->glFramebufferTexture2D (GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
GL_TEXTURE_2D, myDepthStencilTexture->TextureId(), 0);
theGlContext->arbFBO->glFramebufferTexture2D (GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT,
GL_TEXTURE_2D, myDepthStencilTexture->TextureId(), 0);
#endif
}
else if (myGlDepthRBufferId != NO_RENDERBUFFER)
{
theGlContext->arbFBO->glFramebufferRenderbuffer (GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
GL_RENDERBUFFER, myGlDepthRBufferId);
}
if (theGlContext->arbFBO->glCheckFramebufferStatus (GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
{
Release (theGlContext.operator->());
return Standard_False;
}
UnbindBuffer (theGlContext);
return Standard_True;
}
// =======================================================================
// function : Init
// purpose :
// =======================================================================
Standard_Boolean OpenGl_FrameBuffer::InitLazy (const Handle(OpenGl_Context)& theGlContext,
const GLsizei theViewportSizeX,
const GLsizei theViewportSizeY)
{
if (myVPSizeX == theViewportSizeX
&& myVPSizeY == theViewportSizeY)
{
return IsValid();
}
return Init (theGlContext, theViewportSizeX, theViewportSizeY);
}
// =======================================================================
// function : InitWithRB
// purpose :
// =======================================================================
Standard_Boolean OpenGl_FrameBuffer::InitWithRB (const Handle(OpenGl_Context)& theGlCtx,
const GLsizei theSizeX,
const GLsizei theSizeY,
const GLuint theColorRBufferFromWindow)
{
if (theGlCtx->arbFBO == NULL)
{
return Standard_False;
}
// clean up previous state
Release (theGlCtx.operator->());
// setup viewport sizes as is
myVPSizeX = theSizeX;
myVPSizeY = theSizeY;
const Standard_Integer aSizeX = theSizeX > 0 ? theSizeX : 2;
const Standard_Integer aSizeY = theSizeY > 0 ? theSizeY : 2;
// Create the render-buffers
if (theColorRBufferFromWindow != NO_RENDERBUFFER)
{
myGlColorRBufferId = theColorRBufferFromWindow;
}
else
{
theGlCtx->arbFBO->glGenRenderbuffers (1, &myGlColorRBufferId);
theGlCtx->arbFBO->glBindRenderbuffer (GL_RENDERBUFFER, myGlColorRBufferId);
theGlCtx->arbFBO->glRenderbufferStorage (GL_RENDERBUFFER, GL_RGBA8, aSizeX, aSizeY);
}
theGlCtx->arbFBO->glGenRenderbuffers (1, &myGlDepthRBufferId);
theGlCtx->arbFBO->glBindRenderbuffer (GL_RENDERBUFFER, myGlDepthRBufferId);
theGlCtx->arbFBO->glRenderbufferStorage (GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, aSizeX, aSizeY);
theGlCtx->arbFBO->glBindRenderbuffer (GL_RENDERBUFFER, NO_RENDERBUFFER);
// create FBO
theGlCtx->arbFBO->glGenFramebuffers (1, &myGlFBufferId);
theGlCtx->arbFBO->glBindFramebuffer (GL_FRAMEBUFFER, myGlFBufferId);
theGlCtx->arbFBO->glFramebufferRenderbuffer (GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
GL_RENDERBUFFER, myGlColorRBufferId);
#ifdef GL_DEPTH_STENCIL_ATTACHMENT
theGlCtx->arbFBO->glFramebufferRenderbuffer (GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
GL_RENDERBUFFER, myGlDepthRBufferId);
#else
theGlCtx->arbFBO->glFramebufferRenderbuffer (GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
GL_RENDERBUFFER, myGlDepthRBufferId);
theGlCtx->arbFBO->glFramebufferRenderbuffer (GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT,
GL_RENDERBUFFER, myGlDepthRBufferId);
#endif
if (theGlCtx->arbFBO->glCheckFramebufferStatus (GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
{
UnbindBuffer (theGlCtx);
Release (theGlCtx.operator->());
return Standard_False;
}
UnbindBuffer (theGlCtx);
return Standard_True;
}
// =======================================================================
// function : InitWrapper
// purpose :
// =======================================================================
Standard_Boolean OpenGl_FrameBuffer::InitWrapper (const Handle(OpenGl_Context)& theGlCtx)
{
if (theGlCtx->arbFBO == NULL)
{
return Standard_False;
}
// clean up previous state
Release (theGlCtx.operator->());
GLint anFbo = GLint(NO_FRAMEBUFFER);
::glGetIntegerv (GL_FRAMEBUFFER_BINDING, &anFbo);
if (anFbo == GLint(NO_FRAMEBUFFER))
{
return Standard_False;
}
GLint aColorType = 0;
GLint aColorId = 0;
GLint aDepthType = 0;
GLint aDepthId = 0;
theGlCtx->arbFBO->glGetFramebufferAttachmentParameteriv (GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &aColorType);
theGlCtx->arbFBO->glGetFramebufferAttachmentParameteriv (GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &aDepthType);
myGlFBufferId = GLuint(anFbo);
myIsOwnBuffer = false;
if (aColorType == GL_RENDERBUFFER)
{
theGlCtx->arbFBO->glGetFramebufferAttachmentParameteriv (GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &aColorId);
myGlColorRBufferId = aColorId;
}
else if (aColorType != GL_NONE)
{
TCollection_ExtendedString aMsg = "OpenGl_FrameBuffer::InitWrapper(), color attachment of unsupported type has been skipped!";
theGlCtx->PushMessage (GL_DEBUG_SOURCE_APPLICATION_ARB,
GL_DEBUG_TYPE_ERROR_ARB,
0,
GL_DEBUG_SEVERITY_HIGH_ARB,
aMsg);
}
if (aDepthType == GL_RENDERBUFFER)
{
theGlCtx->arbFBO->glGetFramebufferAttachmentParameteriv (GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &aDepthId);
myGlDepthRBufferId = aDepthId;
}
else if (aDepthType != GL_NONE)
{
TCollection_ExtendedString aMsg = "OpenGl_FrameBuffer::InitWrapper(), depth attachment of unsupported type has been skipped!";
theGlCtx->PushMessage (GL_DEBUG_SOURCE_APPLICATION_ARB,
GL_DEBUG_TYPE_ERROR_ARB,
0,
GL_DEBUG_SEVERITY_HIGH_ARB,
aMsg);
}
// retrieve dimensions
GLuint aRBuffer = myGlColorRBufferId != NO_RENDERBUFFER ? myGlColorRBufferId : myGlDepthRBufferId;
if (aRBuffer != NO_RENDERBUFFER)
{
theGlCtx->arbFBO->glBindRenderbuffer (GL_RENDERBUFFER, aRBuffer);
theGlCtx->arbFBO->glGetRenderbufferParameteriv (GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &myVPSizeX);
theGlCtx->arbFBO->glGetRenderbufferParameteriv (GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &myVPSizeY);
theGlCtx->arbFBO->glBindRenderbuffer (GL_RENDERBUFFER, NO_RENDERBUFFER);
}
return aRBuffer != NO_RENDERBUFFER;
}
// =======================================================================
// function : Release
// purpose :
// =======================================================================
void OpenGl_FrameBuffer::Release (OpenGl_Context* theGlCtx)
{
if (isValidFrameBuffer())
{
// application can not handle this case by exception - this is bug in code
Standard_ASSERT_RETURN (theGlCtx != NULL,
"OpenGl_FrameBuffer destroyed without GL context! Possible GPU memory leakage...",);
if (theGlCtx->IsValid()
&& myIsOwnBuffer)
{
theGlCtx->arbFBO->glDeleteFramebuffers (1, &myGlFBufferId);
if (myGlColorRBufferId != NO_RENDERBUFFER)
{
theGlCtx->arbFBO->glDeleteRenderbuffers (1, &myGlColorRBufferId);
}
if (myGlDepthRBufferId != NO_RENDERBUFFER)
{
theGlCtx->arbFBO->glDeleteRenderbuffers (1, &myGlDepthRBufferId);
}
}
myGlFBufferId = NO_FRAMEBUFFER;
myGlColorRBufferId = NO_RENDERBUFFER;
myGlDepthRBufferId = NO_RENDERBUFFER;
myIsOwnBuffer = false;
}
myColorTexture->Release (theGlCtx);
myDepthStencilTexture->Release (theGlCtx);
}
// =======================================================================
// function : SetupViewport
// purpose :
// =======================================================================
void OpenGl_FrameBuffer::SetupViewport (const Handle(OpenGl_Context)& /*theGlCtx*/)
{
glViewport (0, 0, myVPSizeX, myVPSizeY);
}
// =======================================================================
// function : ChangeViewport
// purpose :
// =======================================================================
void OpenGl_FrameBuffer::ChangeViewport (const GLsizei theVPSizeX,
const GLsizei theVPSizeY)
{
myVPSizeX = theVPSizeX;
myVPSizeY = theVPSizeY;
}
// =======================================================================
// function : BindBuffer
// purpose :
// =======================================================================
void OpenGl_FrameBuffer::BindBuffer (const Handle(OpenGl_Context)& theGlCtx)
{
theGlCtx->arbFBO->glBindFramebuffer (GL_FRAMEBUFFER, myGlFBufferId);
}
// =======================================================================
// function : BindDrawBuffer
// purpose :
// =======================================================================
void OpenGl_FrameBuffer::BindDrawBuffer (const Handle(OpenGl_Context)& theGlCtx)
{
theGlCtx->arbFBO->glBindFramebuffer (GL_DRAW_FRAMEBUFFER, myGlFBufferId);
}
// =======================================================================
// function : BindReadBuffer
// purpose :
// =======================================================================
void OpenGl_FrameBuffer::BindReadBuffer (const Handle(OpenGl_Context)& theGlCtx)
{
theGlCtx->arbFBO->glBindFramebuffer (GL_READ_FRAMEBUFFER, myGlFBufferId);
}
// =======================================================================
// function : UnbindBuffer
// purpose :
// =======================================================================
void OpenGl_FrameBuffer::UnbindBuffer (const Handle(OpenGl_Context)& theGlCtx)
{
if (!theGlCtx->DefaultFrameBuffer().IsNull()
&& theGlCtx->DefaultFrameBuffer().operator->() != this)
{
theGlCtx->DefaultFrameBuffer()->BindBuffer (theGlCtx);
}
else
{
theGlCtx->arbFBO->glBindFramebuffer (GL_FRAMEBUFFER, NO_FRAMEBUFFER);
}
}
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